Answer:
Increase
Explanation:
Vasopressin levels in Giardiasis will increase to reduce water loss and to prevent the dehydration. The hormone Vasopressin targets the collecting ducts of nephrons and stimulates the water reabsorption. The overall result is the formation of concentrated urine to prevent any further water loss from the body. Water retention in the body also helps to restore the blood volume and blood pressure in a person affected with Giardia.